Polymer functionalization and solubilization of carbon nanosheets

Veca, L. Monica; Lu, Fushen; Meziani, Mohammed J.; Cao, Li; Zhang, Puyu; Qi, Guisheng; Qu, Lijun; Shrestha, Mona; Sun, Ya‐Ping

doi:10.1039/b900590k

Cited by 209 publications

(116 citation statements)

References 27 publications

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“…Previous research reported that the inter-layers of graphite can be intercalated by various molecular or ions. 19,20 In addition, the XPS data of GP shows that oxygen functional groups are introduced into the surface of graphite (Table 1). Therefore, the increased interlayer spacing is due to the formation of oxygen groups on the surface of graphene and exfoliation of graphite nanoplatelets with a thickness innanometer scale for complete oxidation efficiency by avoid graphite core/graphite oxide shell particles.…”

Section: -14mentioning

confidence: 99%

Preparation and Characterization of Reduced Graphene Nanosheets via Pre-exfoliation of Graphite Flakes

Meng¹,

Park²

2012

Bulletin of the Korean Chemical Society

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In this work, the reduced graphene nanosheets were synthesized from pre-exfoliated graphite flakes. The pristine graphite flakes were firstly pre-exfoliated to graphite nanoplatelets in the presence of acetic acid. The obtained graphite nanoplatelets were treated by Hummer's method to produce graphite oxide sheets and were finally exfoliated to graphene nanosheets by ultrasonication and reduction processes. The prepared graphene nanosheets were studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM). From the results, it was found that the preexfoliation process showed significant influence on preparation of graphite oxide sheets and graphene nanosheets. The prepared graphene nanosheets were applied to the preparation of conductive materials, which yielded a greatly improved electrical resistance of 200 Ω/sq.

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Section: -14mentioning

confidence: 99%

Preparation and Characterization of Reduced Graphene Nanosheets via Pre-exfoliation of Graphite Flakes

Meng¹,

Park²

2012

Bulletin of the Korean Chemical Society

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“…Functionalized GO derivatives can fulfill specific requirements for various applications. Amine-functionalized porphyrin Pyrrolidine fullerene [74] N-Containing heterocyclic compounds [75] Hydroxyl Polyoxyethylene sorbitol anhydride monolaurate [76] π-π stacking Polyaniline [77] The epoxy groups of GO can be easily attacked by nucleophilic regents, resulting in a nucleophilic substitution reaction to open the epoxy rings. The typically used nucleophilic reagents are organic amine compounds bearing a lone pair of electrons.…”

Section: Functionalized Derivatives Of Gomentioning

confidence: 99%

The Preparation of Graphene Oxide and Its Derivatives and Their Application in Bio-Tribological Systems

et al. 2014

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Graphene oxide (GO) can be readily modified for particular applications due to the existence of abundant oxygen-containing functional groups. Graphene oxide-based materials (GOBMs), which are biocompatible and hydrophilic, have wide potential applications in biomedical engineering and biotechnology. In this review, the preparation and characterization of GO and its derivatives are discussed at first. Subsequently, the biocompatibility and tribological behavior of GOBMs are reviewed. Finally, the applications of GOBMs as lubricants in bio-tribological systems are discussed in detail.

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“…This type of modification has a special interest in the dispersion of functionalized GO in different solvents (polar or non-polar), this is due to the fact that the family of silanes provide a wide range of terminal functional groups. The functionalization of GO via carboxylic acids is one of the most common approaches and is possible by prior activation of these groups through various agents such as thionyl chloride (SOCl 2 ) (Niyogi, Bekyarova et al 2006;Liu, Xu et al 2009;Zhang, Huang et al 2009;Karousis, Economopoulos et al 2010;Zhuang, Chen et al 2010), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC) (Liu, Robinson et al 2008), N, N'-dicyclohexylcarbodiimide (DCC) (Veca, Lu et al 2009) and 2-(7-aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (Hatu) (Mohanty and Berry 2008). Subsequent addition of nucleophilic species, such as amines and hydroxyl, allow the formation of covalent bonds with functional groups of the graphene oxide through formation of amide or ester groups.…”

Section: Covalent Functionalizationmentioning

confidence: 99%